Hadron 2005 review

Hadron 2005-reviewHadron 2005-review

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By Su Houng Lee

Hadron 2005 reviewHadron 2005 review

Rio De Janeiro Aug 05 21->26http://www.cbpf.br/~hadron05/index.htm


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1. Strange quarks in Nucleon: Happex

-exchange Z-exchange2

e’

p p

e e’

p p

e

u

ug = +2/3

d

dg = –1/3

s

sg = –1/3

u

ugZ = 1–8/3 sin2w

d dgZ = –1+4/3 sin2w

s sgZ = –1+4/3 sin2w

+

Recent results from Jefferson Lab


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Strange quark contribution to the proton


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2. N- transition form factorse

e’

γv

N N

(1232)

0 ,

0, 1M1, E2, C2

Preliminary E1+/M1+ is in good agreement with MAID, while S1+/M1+ continues to show strong Q2 dependence.

Consistency between different data sets at low Q2 needs to be understood. Reanalysis of ELSA low Q2 points in progress.


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A comprehensive program to search for pentaquarks in photoproduction experiments at Jeffeson Lab were approved in 2003-2004 with the goal of confirming previous results and explore new kinematics with at least a factor 10 increase in statistics.

g10 deuteron E ~ 1.0-3.5 GeV

data taking completed in 2004

g11 proton E ~ 1.6-3.8 GeV


eg3 deuteron E ~ 4.0-5.4 GeV


Super-g proton E~ 3.8 – 5.7 GeV

planned for 2006

CLAS(d) g2 2003 Phys. Rev. Lett. 91, 252001-1

SAPHIR 2003 Phys. Lett. B572, 127

NA492004 Phys. Rev. Lett. 92, 042003-1

CLAS(p) g62004 Phys. Rev. Lett. 92, 032001-1

Relevant Publication

3. Latest on Pentaquarks


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• Model-independent uppper limit 95% CL for + is < 20nb.

• With assumptions about the spectator, we can set a model-dependent upper limit to the cross section of < 4-5 nb.

M(nK+)(GeV)

preliminar

y


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Still difference between LEPS and J-Lab exits in forward direction


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Charmed mesons spectroscopy chart

In the heavy-quark limit, the heavy-quark spin SQ and the total angular momentum of the light-quark jq=L+S are conserved

PREDICTION #1: Each level is composed of a degenerate doublet of states with the same jq and total angular momentum J=jq± ½. jq=½ states are predicted to be broad (100-200MeV width). PREDICTION #2: FLAVOUR SYMMETRY

LSQ Sq

THIS PARADIGMA FALSIFIED BY BABAR

AND CLEO DISCOVERY

OF Dsj STATES.

Do*D1


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Searches and measurements at

1. L=1 states at Focus (photoproduction at Tevatron) and Belle(B decay) and CDF

2. D_s states at BABAR and Belle


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Hadronic Physics at Belle


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Hadronic Physics at BES


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Recent results on Baryon Spectroscopy

Babar, Belle

Selex


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SummarySummary

1. Bound heavy pentaquark, unbound strange heavy pentaquarkCDF

2. Pentaquark search: forward direction

3. D states

4. Charomium states

5. Charmed baryon state

Documents

Hadron 2005 review